n.
A system of generating electricity with hydroelectric power, in which the electricity is generated during hours of peak consumption by using water that has been pumped into an elevated reservoir during the hours of low consumption.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
